Image Item No. Description By  88393  Brick, Modified 1 x 2 x 5 with Channel Catalog: Parts: Brick, Modified 2  90258  Brick, Modified 2 x 2 with Channels and Axle Hole Catalog: Parts: Brick, Modified 3  87620  Brick, Modified Facet 2 x 2 Catalog: Parts: Brick, Modified 5